Xweig



snostwzwue.

VALVE GEAR.

APPLICATION FILED MAR. 4, I9I9.

Patented Dec. 2.1 919.

/V// 6 6w w i J a: 5. Q

4 c c, c

mx m WITNESSES INVENTOR UNTF.

SIEGFRIED ROSENZWEIG, OF: NEW YORK, N. Y.

VALVE-Gena.

Specification of Letters Patent.

.r'atented llecrflililiitll Application filed March 4-, isle. Serial No.280,550.

To all whom it may concern:

Be it known that I, SIEGFRIEI) Rosnnzwrzro, a citizen of the UnitedStates, residing in New York city, in the county and State of New York,have invented a new and useful Improvement in Valve-Gears, of which thefollowing is a specification.

My invention relates to, and is an improvement on, the form of valvegear construction which is the subject of my application i'or LettersPatent Serial No. 267,620 filed December 2-0, 1918. It will first bedescribed in connection with the accompanying drawing, and will then bemore particularly pointed out in the claim.

In the drawing a Figure l is a transverse section of a steam engine withmy improvement applied thereto, the plane of section being in thevertical plane of the axis of the valve chamber or chest and,

Fig. 2 is a section on line 22 of Fig. 1, with a slight modification inthe construction of the valve chan'iber or chest and sectional valvecage from what is represented in Fig. I.

A is a steam cylinder; B a cylindrical valve chamber or chest extendingcrosswise of, and substantially tangential to the steam cylinder; C anexternally cylindrical valve cage removably fitted and held in the valvechest B which is machined out to receive it and is formed with aninternal shoulder 12 against which the cage brings up when inserted inplace in the 'valve chest; D a clearance chamber in the cage; V a doubleseated puppet valve within the clearance chamber engaging correspondingseats in the clearance chamber; 0 the inlet port through which steam isadinitted into the steam cylinder; w an axial tubular guide for thevalve spindle 10' cast in one with the rear wall of the clearancechamber.

The cage C at its end opposite to that another from opposite sides ofthe cage to-. I ward its center but do not meet, there lm ng an intervalbetween their inner opposcd..eu ls which is spanned by another tubularbearing col h cast in one with the divided bearing y/and" cageC, havingits bore 111 axial ahnement with that of the spindle guide w, anddesigned to receive the roller carrier t on the end of the valvespindle, said roller-carrier having mounted on it the anti-trictionroller L which protrudes into the open space beftween the two ends ofthe divided bearingg in position to be acted on by the longit'udi nallyreciprocating can] or tappet shaft S. The exterior opposite ends of thedivided bearing 9 projects laterally through guide slots 9 in the Wallsof the valve chest B.

As thus far described the construction does not differ materially fromthat which is described and shown in my aforesaid zip plicationSerial'No; 22675620, filed December 20, 1918.; The material differencebetween the two is that in the structure described' and shown in mypreviously filed applica- .tion the cage is aone piece casting,whercfitted, and adapted tobe connected, together,

section formed with the clearance one en chambe and valve seats thereinto cooperate witl tl valve contained therein, and the oppdsite endsection containing the bearings for the valve operating cam shaftand thevalve spindle roller-carrier respectively.

In the particular embodimentof my inprovement illustrated in thedrawings, the cage is composed of two tubular sections, 0 c separablytitted together end to end in the cylindrical valve chest B, thevinterior of which is machined out accurately to receive them, the onesection 0 formed with'the clearance chamber D the valve seats therein tocooperate with the seating faces of the valve V,.and the valve spindleguide at, the other section formed with the divided bearing 9 for thecam operating shaft S and the tubular bearing it for the valve spindlerollencarrier The last named cage-section has the annular flange 0 onthat end of it which projects beyond the valve chest B, which flangeoverlaps the correspondingly flanged end of the steam chest to which itis united by boltsand nuts f. ,The meeting ends of the two sections areinternally flanged as at a, to receive securing devices connect them...

This construction is advantageous especially for large engines in wjhichthe cage,

its. single piece casting is so large as to'he unwieldy and difiicult tohandle. B casting it in a plurality of sections this di culty isavoided. Thesections after being separately cast, have their flangedmeeting ends faced and are then assembled end to end and bolt edtogether so as to form in efiect one completev casting for the purposeof machining all the par-ts together. When thus ma chined and providedwith its appropriate fittings the sectional casting can be inserted. andput in place in the valve chest, either as a single casting, .or inseparate sections which may be bolted togetherv or not as preferred, thecage, in either event being held in secure positionby the shoulder I) atone end and the bolts and nuts at the other.

' In Fig. 1 there is a jog in the steam chest B at the point Where thetwo cage sections meet, forming a shoulder b which is over-'tlie'sections, as shown. The diameter of the part of the steam chest Bwhich reeeives'the nh'shoulderb in'the v'alve chest. The-latterconstruction is on the Whole preferred. Gaskets m of copper Wire areprovided at the joints between the sectionsand other I 1 ,saenzee properpoints as shown. The construction described permit-stile outer endsection of the cage to be removed leaving the inner end section with itscontained fittings in place, if for any cause-for example to get at thevalve controlling spring-it becomes necessary to reach the interior ofthe cage. In the case of unusually large engines it may become necessaryto introduceone or more additional sections as spacers between the ,endcage sections as will be understood without further explanation. v WhatI claim herein as new and desire to secure by. Letters Patent is: Thecombination with a steam cylinder and steam chest of a valvecagecomposed of a plurality of tubular sections separably fitted together,and reniovably held in a seat of corresponding shape in the valve chest.the inner end cage section being formed with a clearance chamber tocontain the valve, seats in'said chamber to cooperate .viththe seatingfaces on the valve, and a tubular spindle guide for the passage andsupport of. the valve spindle, and thejouter' end section being providedwith a bearing for the operating 'cam shaft extending diametricallycrosswise of the open end of said section,

and with a central tubular bearing in axial alinement with the spindleguide, for thesupport and guidance of the-roller end of the valvespindle which engages'the operating cam-shaft.

In testimony Whereof- I aliix my signature.

SIEG'FRIED ROSENZWEIG

